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中国沙漠 ›› 2021, Vol. 41 ›› Issue (2): 181-190.DOI: 10.7522/j.issn.1000-694X.2020.00127

• • 上一篇    下一篇

基于改进的遥感生态指数(MRSEI)的青海省都兰县生态环境质量评价

贾浩巍1,2(), 颜长珍1,3(), 邢学刚1,2, 谢家丽1, 冯坤1,2   

  1. 1.中国科学院西北生态环境资源研究院,甘肃 兰州 730000
    2.中国科学院大学,北京 100049
    3.国家地球系统科学数据中心,北京 100020
  • 收稿日期:2020-08-08 修回日期:2020-12-21 出版日期:2021-03-20 发布日期:2021-03-26
  • 通讯作者: 颜长珍
  • 作者简介:颜长珍(E-mail: yancz@lzb.ac.cn
    贾浩巍(1995—),男,河南洛阳人,硕士研究生,主要从事生态遥感方向的研究。E-mail: 1092454657@qq.com
  • 基金资助:
    国家自然科学基金重点项目(41730752);国家重点研发计划项目(2016YFC0500201)

Evaluation of ecological environment in the Dulan County based on the Modified Remote Sensing Ecological Index Model

Haowei Jia1,2(), Changzhen Yan1,3(), Xuegang Xing1,2, Jiali Xie1, Kun Feng1,2   

  1. 1.Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
    3.National Earth System Science Data Center,Beijing 100020,China
  • Received:2020-08-08 Revised:2020-12-21 Online:2021-03-20 Published:2021-03-26
  • Contact: Changzhen Yan

摘要:

以1995、2005、2015年Landsat TM/ETM+/OLI影像为主要数据源,借助改进的遥感生态指数(MRSEI),对青海省都兰县近20年的生态环境状况进行监测和定量评价。结果表明:(1)1995—2015年,都兰县MRSEI均值从0.300增大到0.381,呈逐年递增趋势。结合MRSEI差值分析,1995—2015年生态等级增加面积所占比例(41.76%)大于生态等级降低所占比例(9.14%),即环境改善的程度大于环境恶化的程度。(2)都兰县的生态环境受气候变化和人为活动的共同作用,MRSEI等级增加的区域主要在都兰县东部,得益于政府生态保护政策和利于植被生长的暖湿气候,等级降低的区域主要集中在都兰县西北部和西南部,主要原因是对盐湖资源过度开发和超载放牧。(3)在未来经济发展中应遵循自然规律,在切实保护现有林草植被的基础上,进行自然资源合理开发和利用。

关键词: 改进的遥感生态指数(MRSEI), 土地利用, 主成分分析, 都兰县

Abstract:

Based on the Landsat TM/ETM+/OLI images in 1995, 2005 and 2015, and using MRSEI index, this research monitored and quantitatively evaluated the ecological environment of Dulan County, Qinghai Province over the past 20 years. The results showed that: (1) From 1995 to 2015, the average MRSEI of Dulan County increased from 0.300 to 0.381, showing an ascending trend year by year. Combined with MRSEI differential analysis, the proportion (41.76%) of areas with increased ecological grades was greater than that (9.14%) of areas with decreased ecological grades from 1995 to 2015, showing that the degree of environmental improvement was greater than that of environmental deterioration. (2) The ecological environment of Dulan County was affected by climate change and human activities. The areas with increased MRSEI levels were mainly concentrated in the east of the county benefiting from the government's ecological protection policy and the warm-humid climate conducive to vegetation growth, while the areas with decreased MRSEI levels were mainly concentrated in the northwest and southwest of the county mainly due to the over-exploitation and over-grazing for the salt lake resources. (3) In the future economic development, we should follow the natural law, and rationally develop and utilize natural resources on the basis of effectively preserving the existing forest and grass vegetation.

Key words: Modified Remote Sensing Ecological Index (MRSEI), land use, principal component analysis, Dulan County

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